September 2016 Energy Recovery Ventilators Models ERM, MiniVent, ERV and ERVe Untempered Preconditioners
September 2016
Energy Recovery VentilatorsModels ERM, MiniVent, ERV and ERVeUntempered Preconditioners
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Energy Recovery Ventilators
Model ERV Model ERVeMiniVent
Greenheck offers a complete line of energy recovery ventilators to reduce your building’s tempering loads in all climates. From outdoor roof-mounted applications to indoor ceiling-mounted units, Greenheck’s preconditioners offer the installation flexibility for both new construction and retrofit applications.
Models MiniVent, ERV and ERVe incorporate innovative design features with varying levels of configurable options and energy wheel performances to provide a quality constructed unit with operational flexibility. The result is a product that will fit seamlessly into your building to improve your indoor air quality while reducing energy costs.
Features Benefits
Industry Leading Selection Software
(CAPS)
Greenheck’s computer aided product selection (CAPS) software reduces design time by quickly analyzing system design parameters and providing a list of units with various energy wheel and fan combinations to minimize cost and optimize performance. The program outputs fan, electrical, and energy wheel performance data, as well as configuration-specific 2-D and 3-D drawings for easy implementation into building schedules and plans.
Compliance with Industry Standards
Code officials recognize the benefits of utilizing energy recovery in applications with large amounts of ventilation air. Greenheck’s third party certification for energy wheel performance (AHRI) verifies the units provide the mandated energy recovery effectiveness per ASHRAE standards and energy codes.
Maintenance/ Serviceability
Greenheck’s preconditioners have been designed to allow easy access to filters, blower assemblies and wheel cassettes. As reassurance to the customer, each unit carries a one year warranty and each energy wheel (segments, cassette, belt and pulleys) carries a five year warranty.
System Efficiency/ Payback
The incorporation of energy recovery allows for equipment downsizing as well as continued lower energy costs throughout the life of the equipment. This downsizing moderates the variability of loads on the system, increasing the efficiency of furnaces, electric heaters, DX coils and water systems.
Greenheck takes pride in offering a high quality, reliable product. We invest our resources into designing, testing and manufacturing products to ensure customer satisfaction.
ETL Listed for electrical and overall unit safety. Every unit is tested at the factory before it is shipped to the jobsite.
Energy recovery wheels are certified by the AHRI Air-to-Air Energy Recovery Ventilation Equipment Certification Program in accordance with AHRI Standard 1060. Actual performance in packaged equipment may vary. Certified ratings are available in the Certified Product Directory at ahridirectory.org.
Product Certifications
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Energy Recovery
Zone
Percentage of Outdoor Air at Full Design Airflow Rate (cfm)
30% ≤ 40% 40% ≤ 50% 50% ≤ 60% 60% ≤ 70% 70% ≤ 80% ≥ 80%
Design Supply Fan Airflow Rate (cfm)
3B, 3C, 4B, 4C, 5B NR NR NR NR ≥ 5,000 ≥ 5,000
1B, 2B, 5C NR NR ≥ 26,000 ≥ 12,000 ≥ 5,000 ≥ 4,000
6B ≥ 11,000 ≥ 5,500 ≥ 4,500 ≥ 3,500 ≥ 2,500 ≥ 1,500
1A, 2A, 3A, 4A, 5A, 6A ≥ 5,500 ≥ 4,500 ≥ 3,500 ≥ 2,000 ≥ 1,000 ≥ 0
7, 8 ≥ 2,500 ≥ 1,000 ≥ 0 ≥ 0 ≥ 0 ≥ 0
NR = Not recommended
Energy recovery is the process through which energy is transferred between the conditioned return air from the space and the fresh outdoor air which imposes the load on the equipment. This is done by rotating an energy wheel between the two airstreams. All energy wheels include:• Polymer heat transfer media for sensible energy transfer• Silica gel desiccant permanently bonded to polymer media for latent energy transfer• Removable segments for ease of maintenance
Exhaust Air
Outdoor Air95°F
117 grains/lb.
Supply Air79°F
75 grains/lb.
Return Air75°F
50% RH
Summer Operation
Exhaust Air
Outdoor Air10°F
5 grains/lb.
Supply Air60°F
39 grains/lb.
Return Air72°F
35% RH
Winter Operation
How does energy recovery work?
ASHRAE 90.1-2010 requires the use of energy recovery based upon a unit’s supply airflow, outdoor air percentage, and geographic location. The standard mandates the total effectiveness (sensible and latent) be a minimum of 50%. This language has been adopted in the 2012 International Energy Conservation Code®.
The effectiveness of energy recovery varies depending on the device type, material, and airflow balance. This value is determined based on the test procedure outlined in the Air-Conditioning, Heating, and Refrigeration Institution (AHRI) Standard 1060.
Why use energy recovery?
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Typical Applications
• Animal Shelters • Bars and Clubs • Veterinary Hospitals • Office Buildings
• Churches • Dormitories • Function Halls • Printing Shops
• Locker Rooms • Nursing Homes • Schools • Restaurants
Typical Applications for Energy Recovery
EnergyWheel
CoolingCoil
HeatingCoil
RELIEF AIR
RESTROOM
EXHAUST AIR
OUTDOOR AIR
ENERGY RECOVERY VENTILATOR (ERV)
AIR HANDLINGUNIT (AHU)
72°F 50% 72°F 50%
ZONE 1 ZONE 2
OUTDOORAIR
RETURN AIR
RETURN AIR
ExhaustFan
AHU
CoolingCoil
HeatingCoil
Energy Recovery with Ducted Air Handlers
EnergyWheel
RESTROOM
RETURN AIR
RETURN AIR
RETURN AIR
EXHAUSTAIR
ENERGY RECOVERYVENTILATOR (ERV)
OUTDOORAIR
Packaged Rooftop Unit
(RTU)
RTU RTU
OUTDOORAIR
SupplyFan
ExhaustFan
Energy Recovery with Packaged Rooftop Equipment
ENERGY RECOVERYVENTILATOR (ERV)
OUTDOORAIR
RETURN AIR
EXHAUSTAIR
EnergyWheel
RESTROOM
ZONE 1
ZONE 2
VAVBOX
VAVBOX
AIR HANDLING UNIT
OUTDOORAIR
SupplyFan
ExhaustFan
Energy Recovery with Variable Air Volume
Preconditioner Applications
These diagrams illustrate how energy recovery units can be used in conjunction with other HVAC equipment. Fresh, outdoor air enters the energy recovery unit and is pretreated before entering the heating and cooling equipment.
Whether ducting into terminal units, such as air handlers, or directly feeding into a rooftop unit, these preconditioners provide the ability to reduce the outdoor air load of these systems.
Recovering Restroom Exhaust
ASHRAE Standard 62.1 dictates that energy recovery devices rated for less than 10% cross-contamination can return restroom exhaust through the device. Any volume of air transferred through the device can be reclassified as fresh outdoor air. All of Greenheck’s energy recovery units are rated well below the 10% limit, therefore it is not only allowable to return restroom exhaust, but is recommended to maximize the benefit.
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Energy Savings
Equipment Reduction using Energy Recovery on 3,000 cfm Outdoor Air
Natural Gas Price ($/therm)
Electric Cost ($/kWh)
Cooling Equipment Reduction (tons)
Annual Summer Cooling Savings
Annual Winter Heating Savings
Approximate Payback (Years)
Boston, MA 1.14 0.1433 6.29 $451 $1,241 1.97
Houston, TX 0.69 0.0883 11.70 $1,584 $308 1.19
Minneapolis, MN 0.73 0.0863 8.05 $348 $1,215 1.67
Phoenix, AZ 0.98 0.0950 7.12 $531 $374 2.04
Raleigh, NC 0.94 0.0813 10.30 $806 $805 1.36
St. Louis, MO 0.98 0.0804 13.53 $625 $1,288 1.05
Tampa, FL 1.09 0.0985 13.18 $2,182 $238 1.03
Actual savings will vary based on system design and application. Data source: U.S. Energy Information Administration, Natural Gas Annual and Monthly Electric Sales and Revenue Report with State Distributions Report, 2011 Assumptions: $4/cfm energy recovery cost; $700/ton avoided cooling equipment cost; 70% effective energy wheel; operating hours: Mon.-Fri., 6am-6pm
AHU
AHU
3000 cfm1500 cfm
3000 cfm 6000 cfm
3000 cfm 3000 cfm 6000 cfm
3000 cfm 6000 cfm
3000 cfm
3000 cfm
1500 cfm
Traditional System: An air handling unit and exhaust fan handle the entire load.
Sea level psychrometric chart. Barometric pressure of 29.921 in. Hg.
3540
4550
5560
65
70
75
80
85180
160
140
120
100
80
60
40
20
Spe
cific
Hum
idity
Gra
ins
H2O
/ #
D.A
.
Dry Bulb Temperature (ºF)
90%
70%
50%
30%
10%
40 50 60 70 80 90 100 110
26.2
tons
Coo
lin
g
Mixing
Air
Return Air
Outdoor Air
Mixed Air
Discharge
Wet
Bulb Te
mperat
ure (º
F)
Wet
Bulb Te
mperat
ure (º
F)
Traditional System with Energy Recovery: An energy recovery unit reduces the outdoor air load on the AHU and replaces the exhaust fan.
Load Reduction
Sea level psychrometric chart. Barometric pressure of 29.921 in. Hg.
3540
4550
5560
65
70
75
80
85180
160
140
120
100
80
60
40
20
Spe
cific
Hum
idity
Gra
ins
H2O
/ #
D.A
.
Dry Bulb Temperature (ºF)
90%
70%
50%
30%
10%
40 50 60 70 80 90 100 110
Outdoor Air
Room AirDischarge
Load Reduction
Mixed Air
15
.7 ton
s
Coolin
g
En
erg
y Whe
el
Mixing
Air
Wet
BulbTe
mperatur
e (ºF
)
Wet
BulbTe
mperatur
e (ºF
)
AHU
AHU
3000 cfm1500 cfm
3000 cfm 6000 cfm
3000 cfm 3000 cfm 6000 cfm
3000 cfm 6000 cfm
3000 cfm
3000 cfm
1500 cfm
Required Supply Air (cfm)
Minimum Outdoor Air (cfm)
Minimum Exhaust (cfm)
Outdoor Design (DB/WB)
Indoor Design (DB/RH)
6,000 3,000 1,500 95ºF/78ºF 75ºF/50%RH
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Model ERM
Greenheck’s model ERM is a modular energy recovery device capable of handling 600 to 10,000 cfm of ventilation air. This unit is designed for new construction or retrofit applications where an energy recovery ventilator may not meet space requirements. The ERM consists of a fully insulated cabinet, installed as a permanent part of the duct system. The energy recovery wheel is completely accessible through a removable panel or duct access. A wiring box for connection to the electrical supply is also a standard feature.
Models ERM-36 and 52 are easily installed either vertically or horizontally. Models ERM-58, 64, and 74 must be installed in the vertical position due to size and weight. The diagram illustrates a typical horizontal installation of multiple modules where airflow exceeds single wheel capacities.
ModelA B C D E F G Approx.
Weight (lbs.)
Airflow Range (cfm)
Voltage Hertz Amps Phase Motor HP
inches
ERM-36S/H 34.3 45.4 42 14.8 14.8 14.6 16.6 170 600 - 2,300 200-230/460 50/60 1.2 1 1/6
ERM-52S/H 50.4 61.6 58.4 22.4 22.4 14.6 16.6 280 2,300 - 4,500 200-230/460 50/60 2.8 1 1/2
ERM-58H 54 64.6 62.7 24.1 24.1 16.5 18.7 440 4,500 - 6,000 200-230/460 60 1.3-1.2/0.6 3 1/4
ERM-64H 59.8 70.4 68.2 26.9 26.9 19.1 21.1 700 6,000 - 7,500 200-230/460 60 1.3-1.2/0.6 3 1/4
ERM-74H 69.9 80.2 78.5 31.5 31.5 20.1 22.1 870 7,500 - 10,000 200-230/460 60 1.3-1.2/0.6 3 1/4
ERM-2ERM-3
ERM-1
Outdoor AirSupply
Room AirIntake
Outdoor AirIntake
Direction of cassette removal
Room AirExhaust
Model Number Code
Model Parent
Wheel Diameter36 (36 in.)52 (52 in.)58 (58 in.)64 (64 in.)74 (74 in.)
Wheel Thickness 15 (11/2 in.) 30 (3 in.)
ERM - 36S - 15
Airflow RateH - HighS - Low
A B
CD E G
F
Typical Installation
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Model MiniVent
Outdoor Air
Exhaust AirReturn Air
Pre-conditioned Supply Air
A
B
C
Models MiniVent-450 and 750 are energy recovery ventilators for commercial and institutional applications that require 150 to 850 cfm of ventilation air. The compact design provides an economical solution for individual spaces, such as school classrooms and small offices. The MiniVent is designed for indoor installations and may be floor-mounted or ceiling-hung. A removable panel enables easy access to filters and enthalpy wheel. Units come standard with backdraft dampers and optional Vari-Green® electronically commutated (EC) motors are available.
ModelA B C Approx.
Weight (lbs.)
Airflow Range (cfm)inches
450 37.6 26.4 19.9 150 150 - 500
750 43.2 33 23.8 250 450 - 850
The illustration shows a MiniVent in a typical ceiling-hung installation.
Outdoor air is drawn through a model GRS roof mounted gravity intake hood and preconditioned by the enthalpy wheel. Outdoor air is then supplied either to an air handler or directly to the space. Energy is recovered from stale return air before it is exhausted through a model WC wall cap.
Model Number Code
Model Parent
MiniVent - 750
Nominal Airflow450 (450 cfm)750 (750 cfm)
Available Intake/Discharge Positions
Option Bottom Top Side End
OA Intake X X
SA Discharge X
RA Intake X X
EA Discharge X
Typical Installation
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Models ERV-10, 20, and 45 are designed for indoor and outdoor mounted commercial and institutional applications requiring 500 to 4,500 cfm of ventilation air. A key design consideration for these units is mounting location. Several duct configurations allow for floor-mounted or ceiling-hung installation. Access panels allow for easy access to the unit’s wheel, filters, motors and controls.
Model ERV
A
B
C
SUPPLY FILTERS
WHEEL CASSETTE
EXHAUST FILTERS
ELECTRICAL BOX
SUPPLYFILTERS
ENERGYWHEEL
ERV-10, 20, 45
ModelA B C Approx.
Weight (lbs.)
Airflow Range (cfm)inches
ERV-10 46.2 28 33.8 300 500 - 1,000
ERV-20 62 34.4 51.1 720 1,000 - 2,000
ERV-45 67 44.7 67.1 1100 2,200 - 4,500
All weights include dampers and filters.
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ModelA B C D E Approx.
Weight (lbs.)
Airflow Range (cfm)inches
ERV-90 124.4 66.3 84.1 16.4 25.3 3,230 4,000 - 9,000
ERV-120 146.1 76.4 96.5 18.0 29.3 3,700 9,000 - 12,000
All weights include weatherhoods, dampers, and filters.
Model ERV
D
SUPPLY FILTERS
WHEEL CASSETTE
EXHAUST FILTERS
WHEEL CASSETTE
EXHAUSTWEATHERHOOD
OUTDOORWEATHERHOOD
ENERGYWHEEL
ENERGYWHEEL
SUPPLYFILTERS
ELECTRICAL BOX
OUTDOORWEATHERHOOD
C
E
A
B
ERV-90, 120
Model Number Code
Model Parent
ERV - 45 - 30H
Airflow RateH - HighL - Low
Nominal Airflow 10 (1,000 cfm) 20 (2,000 cfm) 45 (4,500 cfm) 90 (9,000 cfm) 120 (12,000 cfm)
Wheel Thickness 15 (11/2 in.) 30 (3 in.)
Available Intake/Discharge Positions
Option Bottom Top Side End
OA Intake X
SA Discharge X X
RA Intake X
EA Discharge X X
Models ERV-90 and 120 are designed for both indoor and outdoor applications requiring 4,000 to 12,000 cfm of ventilation air. The dual-wheel design provides exceptional effectiveness while retaining its ease of maintenance characteristics.
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Model ERVe
The model ERVe is designed for outdoor-mounted commercial and institutional applications requiring 1,000 to 6,000 cfm of ventilation air. The configurability of this unit allows for easy incorporation on rooftops or outdoor pad mounting scenarios. Hinged doors allow easy access to the unit’s wheel, filters, motor and controls.
ModelA B C D E Approx.
Weight (lbs.)
Airflow Range (cfm)inches
ERVe-20 65.9 52.6 45.1 18 20.7 950 1,000 - 2,200
ERVe-35 68.1 62.6 53.2 22.1 17.8 1,270 2,200 - 3,400
ERVe-45 72.1 68.9 60.2 22 19.1 1,500 3,400 - 4,500
ERVe-55 83 75.4 70.2 21.7 23.5 1,960 4,500 - 6,000
All weights include weatherhoods, dampers, and filters.
Model Number Code
Model Parent
ERVe - 35 - 30H
Airflow RateH - HighL - Low
Nominal Airflow20 (2,000 cfm)35 (3,500 cfm)45 (4,500 cfm)55 (6,000 cfm)
Wheel Thickness 15 (1.5 in.) 30 (3 in.)
Available Intake/Discharge Positions
Option Bottom Top Side End
OA Intake X
SA Discharge X X
RA Intake X X
EA Discharge X
OUTDOORWEATHERHOOD
EXHAUSTWEATHERHOOD
SUPP
LY F
ILTER
S
WHE
EL C
ASSE
TTE
EXHA
UST
FILT
ERS
ELECTRICAL BOX
WHE
EL C
ASSE
TTE
SUPP
LY F
ILTER
S
OUTDOORWEATHERHOOD
D
E
C
A
B
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Energy Wheel Economizer ControlWhen the outdoor air conditions are favorable, the controller will allow the economizer operation. The unit will adjust the energy wheel operation to:
• Stop wheel - Energy wheel rotation will stop and outdoor air can be brought into the building unconditioned
• Modulate wheel - Energy wheel speed will modulate to maintain a leaving wheel temperature of 55ºF
Energy Wheel Frost ControlPrevents frost buildup on the energy wheel in climates that have cold outdoor winter temperatures (typically less than -10ºF) and/or moist indoor conditions such as a gym locker room. Available options are:
• Timed exhaust - Cycles supply blower to melt frost with warm return air
• Electric preheat - Preheats outdoor air to avoid frosting
• Modulate wheel - Reduces the wheel speed to increase the time exposed in the warm return air
Fan Speed ControlTo accommodate the system requirements, the fan speed can be adjusted to:
• Multi-speed - Allows the fan to operate at three preset speeds determined by a set of input contacts
• Modulating - Vary the fan speed from 50-100% based on an analog input signal
Demand Control VentilationVaries the amount of outdoor air based on occupancy. Available options are:
• CO2 Sensor - Mounted in the unit, return air duct or in the space, this sensor determines occupancy and modulates the fan speed accordingly or it cycles the unit on and off to provide the appropriate amount of outdoor air.
• Time clock - A remote panel can be equipped with a 7-day programmable time clock to turn the unit off based on a schedule.
Network InterfaceThe network interface offers an easy-to-use, remote-
mounted display which can monitor and control the unit to verify proper operation and assist with maintenance notification without the need for full microprocessor capabilities. It easily integrates to BACnet® MS/TP or IP, LonWorks® or Modbus® RTU.
Two operating options are available:
• Monitor - Allows the BMS to monitor the status and functions of the unit through a factory installed controller.
• Monitor and control - Allows the BMS to monitor the status and command the basic functions of the unit through a factory-installed controller. A remote panel is not available with this option.
In addition to standard analog control, Greenheck is proud to offer the following direct digital control option.
Unit Control Options
Optional Control Sequences
Optional Control Sequences and Unit Control Options
Preheat Frost Control Recommended*
Timed Exhaust Frost Control Recommended*
No Frost Control Needed
*Modulating Wheel Frost Control can also be used in these areas.
Frost Control Strategy Recommendations
Winter Outside Air Design
Winter Indoor Air Design
Recommended Frost Control
Strategy
≥10ºF ≤50%RH None
≥-5ºF <10ºF ≤35%RH Timed
Exhaust
≥10ºF ≥50%RH
Electric Preheat
≥-5ºF <10ºF ≥35%RH
<-5ºF Any RH
Greenheck P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com
Copyright © 2016 Greenheck Fan Corp. • 00.TAP.1041 R4 9-2016 IW
Our CommitmentAs a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.
Specific Greenheck product warranties are located on greenheck.com within the product area tabs and in the Library under Warranties.
Prepared to SupportGreen Building Efforts
Additional Energy Recovery Products
Model RVEThis rooftop ventilation unit combines the benefits of total energy recovery with supplemental heating and cooling for indoor or outdoor applications designed to process high percentages of outdoor air. Airflow capacities range from 800 to 13,500 cfm.
Model ERCHThis dedicated outdoor air unit combines the benefits of total energy recovery with supplemental heating and cooling for applications designed to supply 100% outdoor air. Airflow capacities range from 1,000 to 10,000 cfm.
Model APEXThis unit combines energy recovery along with several heating and cooling options. This large capacity dedicated outdoor air unit is designed for 100% outside airflow and capacities that range from 10,000 to 20,000 cfm.
Enjoy Greenheck’s extraordinary service, before, during and after the sale.
Greenheck offers added value to our wide selection of top performing, energy-efficient products by providing several unique Greenheck service programs. • Our Quick Delivery Program ensures shipment of our in-stock products within 24 hours
of placing your order. Our Quick Build made-to-order products can be produced in 1-3-5-10-15 or 25-day production cycles, depending upon their complexity.
• Greenheck’s free Computer Aided Product Selection program (CAPS), rated by many as the best in the industry, helps you conveniently and efficiently select the right products for the challenge at hand.
• Greenheck has been Green for a long time! Our energy-saving products and ongoing corporate commitment to sustainability can help you qualify for LEED credits.
• Our 3D service allows you to download, at no charge, easy-to-use AutoDesk™ Revit™ 3D drawings for many of our ventilation products.
Find out more about these special Greenheck services at greenheck.com